comp.lang.idl-pvwave archive: archive » Re: Has USERSYM been defined?

Home » Public Forums » archive » Re: Has USERSYM been defined?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Has USERSYM been defined? [message #29594 is a reply to message #29593]

Tue, 05 March 2002 12:47

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"David Fanning" <david@dfanning.com> wrote in message
news:MPG.16eebb31cf80510798982f@news.frii.com...
> Wayne Landsman (landsman@mpb.gsfc.nasa.gov) writes:
>
>> Is there any way to determine if a user-defined plotting symbol has
>> been created using USERSYM for plotting with PSYM=8? (I suppose it
>> might also be nice if one could determine what the user-defined
>> symbol actually is, i.e. fetch the X,Y vectors that were input to
>> USERSYM, but I don't need that now.)
>>

>> I want to have my plotting program use the current USERSYM
>> definition for PSYM=8 if it exists, but to create a default symbol
>> if no current USERSYM definition exists.
>

> My impression is that the whole USERSYM business is a hold-over from
> the way graphics were done in the 70's.

Indeed.

> I'd bet a lot of money the answer is "no". (Or, even more likely,
> "hell no".)

How much money, David?

How about plotting a test dataset inside a CATCH handler and trapping
the error? Attempting to display a user symbol that is not yet defined
results (in IDL 5.5) in an error with name 'IDL_M_PLOT_NOUSERSYM'

---
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)

Report message to a moderator

[Message index]

		Re: Has USERSYM been defined? By: R.Bauer on Wed, 06 March 2002 04:40
		Re: Has USERSYM been defined? By: Liam E. Gumley on Tue, 05 March 2002 13:26
		Re: Has USERSYM been defined? By: David Fanning on Tue, 05 March 2002 13:01
		Re: Has USERSYM been defined? By: Mark Hadfield on Tue, 05 March 2002 12:47
		Re: Has USERSYM been defined? By: David Fanning on Tue, 05 March 2002 10:24

Previous Topic:	Odd behavior of Device, cursor_image
Next Topic:	Re: IDL books?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 09:28:54 PDT 2025

Total time taken to generate the page: 0.79972 seconds